Constant speed control for a motor
US5847524A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 1997 |
| Grant date | Dec 8, 1998 |
| Priority date | — |
| Expiry date | Mar 20, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor having a power switching circuit adapted to be connected between a power source and its winding for selectively energizing the winding to generate a magnetic field which causes a rotating assembly to rotate. A position sensing circuit provides a position signal representative of the position of the rotating assembly and a commutating circuit controls the power switching circuit to commutate the power switching circuit at a commutating angle to achieve a desired rotating speed of the rotating assembly. The commutating circuit varies the commutating angle in response to the position signal to maintain the substantially constant rotating speed of the rotating assembly. As result, the efficiency of the motor is varied to maintain the substantially constant rotating speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.